ABB Relion 650 Series REB650 Technical Manual page 558

Busbar protection
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Section 19
Time inverse characteristics
552
GUID-B55D0F5F-9265-4D9A-A7C0-E274AA3A6BB1 V1 EN
Figure 245:
Inverse curve B characteristic of undervoltage protection
1MRK 505 288-UEN A
Technical manual

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